From: "qusielle@gmail.com" <qusielle@gmail.com>
To: Junio C Hamano <gitster@pobox.com>,
qusielle via GitGitGadget <gitgitgadget@gmail.com>
Cc: git@vger.kernel.org
Subject: Re: Re: [PATCH 1/1] add: respect `--ignore-errors` when `lstat()` reports errors
Date: Sun, 3 Nov 2019 21:17:10 +0100 [thread overview]
Message-ID: <eac0456e-0f61-9424-975d-0567bb92327d@gmail.com> (raw)
In-Reply-To: <xmqq36fdbp8v.fsf@gitster-ct.c.googlers.com>
Dear Junio,
Thank you for reviewing my patch. I completely agree with you, that
add_to_index() should not be called with undefined data.
I will amend patch now with proposed changes.
Thank you!
Best regards,
Qusielle
On 28.10.2019 03:03, Junio C Hamano wrote:
> "qusielle via GitGitGadget" <gitgitgadget@gmail.com> writes:
>
>> From: qusielle <31454380+qusielle@users.noreply.github.com>
>>
>> "git add --ignore-errors" command fails immediately when lstat returns
>> an error, despite the ignore errors' flag is enabled.
>> ...
>> diff --git a/read-cache.c b/read-cache.c
>> index 133f790fa4..67237ecd29 100644
>> --- a/read-cache.c
>> +++ b/read-cache.c
>> @@ -801,7 +801,7 @@ int add_to_index(struct index_state *istate, const char *path, struct stat *st,
>> int add_file_to_index(struct index_state *istate, const char *path, int flags)
>> {
>> struct stat st;
>> - if (lstat(path, &st))
>> + if (lstat(path, &st) && !(flags & ADD_CACHE_IGNORE_ERRORS))
>> die_errno(_("unable to stat '%s'"), path);
>> return add_to_index(istate, path, &st, flags);
>> }
> The only callers of this function that matter calls it and then
> responds to an error return like so:
>
> (in builtin/add.c::update_callback())
>
> if (add_file_to_index(&the_index, path, data->flags)) {
> if (!(data->flags & ADD_CACHE_IGNORE_ERRORS))
> die(_("updating files failed"));
>
>
> (in builtin/add.c::add_files(), where ignore_add_errors was used to
> set the ADD_CACHE_IGNORE_ERRORS to flags in its caller)
>
> if (add_file_to_index(&the_index, dir->entries[i]->name, flags)) {
> if (!ignore_add_errors)
> die(_("adding files failed"));
>
> So you correctly identified what is the right place to fix. We
> should not "die_errno()"; we should give the control back to the
> caller instead.
>
> But after a failed stat, the code with your patch still calls
> add_to_index() using the now undefined stat data, which would
> contaminate the in-core index with wrong data.
>
> I think we should instead return without touching the index for the
> path we had trouble lstat()ing.
>
> IOW
>
> if (lstat(path, &st)) {
> if (flags & ADD_CACHE_IGNORE_ERRORS)
> return -1;
> else
> die_errno(_("unable to ..."));
> }
> return add_to_index(...);
>
>
next prev parent reply other threads:[~2019-11-03 20:17 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-10-26 21:59 [PATCH 0/1] add: respect --ignore-errors when lstat() reports errors Qusielle via GitGitGadget
2019-10-26 21:59 ` [PATCH 1/1] add: respect `--ignore-errors` when `lstat()` " qusielle via GitGitGadget
2019-10-28 2:03 ` Junio C Hamano
2019-11-03 20:17 ` qusielle [this message]
2019-11-03 20:26 ` [PATCH v2 0/1] add: respect --ignore-errors when lstat() " Qusielle via GitGitGadget
2019-11-03 20:26 ` [PATCH v2 1/1] add: respect `--ignore-errors` when `lstat()` " qusielle via GitGitGadget
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